feature proposal: pretty printing of Native format

["Laurent René de Cotret" <laurent.decotret-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hello,

I often work on Pandoc filters, and I regularly look at Pandoc's native 
format.

Here is an example of the output in my terminal:
> pandoc -i myfile.md --to native
[Para [Image ("fig:myfigure",[],[]) [Str "Figure",Space,Str "1:",Space,Str 
"This",Space,Str "is",Space,Str "a",Space,Str "caption"] 
("generated/other\\8842295943125512100.jpg","fig:")]
,Para [Str "As",Space,Str "you",Space,Str "can",Space,Str "see",Space,Str 
"in",Space,Str "fig.\160\&1,",Space,Str "pandoc-crossref",Space,Str 
"is",Space,Str "compatible",Space,Str "with",Space,Str "the",Space,Str 
"ouput",Space,Str "of",Space,Str "pandoc-pyplot."]]

It would be very useful to get a pretty-printing version of the above, e.g.:

[
    Para [
        Image 
            ("fig:myfigure",[],[]) 
            [Str "Figure",Space,Str "1:",Space,Str "This",Space,Str 
"is",Space,Str "a",Space,Str "caption"] 
            ("generated/other\\8842295943125512100.jpg","fig:")
         ],
    Para [
        Str "As",Space,Str "you",Space,Str "can",Space,Str "see",Space,Str 
"in",Space,Str "fig.\160\&1,",Space,Str "pandoc-crossref",Space,
        Str "is",Space,Str "compatible",Space,Str "with",Space,Str 
"the",Space,Str "ouput",Space,Str "of",Space, Str "pandoc-pyplot."
         ]
]

After a cursory look at the source in Text.Pandoc.Writers.Native, it would 
be possible to make a nice, indented, pretty version of native Haskell, 
given that WriterOptions type has the writerColumns attribute.

Is this something that the Pandoc community might be interested in? Should 
it be a different format than "native", called "pretty-native" or something?

I'm happy to put together a pull request.

Laurent

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